Wort Oxygenation Systems Flashcards
(17 cards)
Why is oxygen important for yeast during fermentation?
Yeast requires oxygen to make unsaturated fatty acids and sterols, particularly ergosterol, which are key components of cell membranes
What process do yeast undergo that requires cell membrane material?
Budding
What is ‘yeast growth’ defined as?
An exponential increase in population
What limits the amount of essential lipids available for yeast?
The generally limited amount of these essential lipids in wort
How does oxygen addition affect yeast growth?
It produces a fixed amount of cell membrane material synthesis, promoting a fixed amount of cell growth
What are the consequences of inadequate oxygen levels for yeast?
Sluggish fermentations, hanging fermentations, poor yeast growth, poor yeast health, increased microbial contamination
What problems can arise from sluggish fermentations?
Poor beer flavour
What is a potential outcome of hanging fermentations?
Failing to attenuate to the required degree
What does poor yeast growth lead to?
Inadequate number of yeast cells to complete fermentation
What can result from poor yeast health?
Yeast not suitable for reuse
What increases the risk of microbial contamination in beer?
Insufficient yeast activity
What is often underestimated in the brewing process?
The importance of oxygen to yeast and fermentation performance
What is easier to measure in real time compared to lipid compounds in yeast cells?
The amount of oxygen given to the yeast
Fill in the blank: The absence of adequate oxygen levels can cause _____ fermentations.
sluggish
Fill in the blank: Yeast synthesizes unsaturated fatty acids and sterols at the start of _____
fermentation
True or False: The degree of oxygen addition does not significantly affect yeast growth.
False
What does the amount of oxygen added to yeast determine?
The amount of yeast growth
